Grinding-machine



Nu. 62|,I8l. Patented Mar. l4, I899. I). S. THOMPSON.

GRINDING MACHINE.

(Application filed July 2, 1898.)

(No Model.) 2 Sheets8heet l.

INVENTOH .A 77'OHNEYS,

No. 62I,l8l. Patented-Mar. l4, I899. n. s. THOMPSON.

GRINDING MACHINE.

(Application filed July 2, 1898.) (No Model.) 2 sheets-sheet 2.

T I I k f 1 2 2 /7, I I, 5 J1 l (Z5 1" 7A a 1 k I WITNESSES /N VENTOH A TTOHNZ' rs.

THE NORRIS PETERS 00.; imoYo-uwu, WASHINGYON, a. c.

lJNITED STATES PATENT Orrrcn.

DAVILLA STURTEVANT THOMPSON, OF LlVERMORE FALLS, MAII'E.

GRINDING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 621,181, dated March 14, 1899.

Application filed July 2, 1898. Serial No. 685,054. (No model.)

To all whom it may concern.-

Be it known that I, DAVILLA STURTEVANT THOMPSON, of Livermore Falls, in the county of Androscoggin and State of Maine, have invented a new and Improved Grinding-Machine, of which the following is a full, clear, and exact description.

The object of the invention is to provide av new and improved grinding-machine more especially designed for the use of manufacturing Opticians for grinding lenses and the like very accurately, the machine being simple and durable in construction, very effective, noiseless, and automatic in operation, and requiring but little attention while in action.

The invention consists of novel features and parts and combinations of the same, as will be fully described hereinafter and then pointed out in'the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a plan view of the improvement. Fig. 2 is a side elevation of the same. Fig. 3 is a sectional side elevation of the same.

Fig. 4. is a plan view of the centrifugal pump,

and Fig. 5 is an enlarged sectional side elevation of the object-carrier.

The improved grinding-.ma'chine is provided with standards A, supporting a table B, on which is held a bearing O for the up per end of-a shaft D, disposed vertically and set with its lower end in a suitable step 0, carried by a bracket E, which also serves as a protector for a belt D passing over a pulley D, secured on the shaft D. The belt D also passes over pulleys D mounted on a shaft journale'd in suitable bearings attached to the under side of the table B, and said shaft is connected with suitable machinery for imparting a rotary motion to the shaft D.

On the extreme upper end of the shaft D is secured a supporting-disk F for the object G to be ground, the latter being pressed in contact with the disk and moved laterally on the same by a carrier II in the form of a ball, held on a shank fitted loosely in a sleeve H, carried in a second sleeve H attached to a spindle H the lower end of which rests on a ball 11 on the top of the shank for the ball H. The upper end II of the spindle H is secured to the free end of an arm I, mounted to swing on a transversely-extending bolt J carried in the eye J 2 of a spindle .I, disposed vertically and mounted to turn in suitable bearings 0 carried by the table B. The arm I is drawn on by a spring 1 so as to hold the ball-carrier H in proper contact with the object and permit of moving the object or work laterally on the disk F. As shown in the drawings, two such arms I and carriers H are employed and both may be used simultaneously or one may be thrown out of action, as indicated in dotted lines in Fig. 8. In order to hold either arm I in an inactive position, a catch 1 pivoted to the arm, is adapted to engage a notch J 3 on the peripheral surface of the eye J 2 of the spindle J, said catch being engaged and controlled by the inner end of a hand-lever I fulcrumed on the inside of the corresponding arm I. When either arm I is swung upward, the catch 1 drops into the notch to support the arm in an i11- active position, and when the operator presses the forward end of the hand-lever I then the catch I swings out of engagement with the notch J and the arm I can then be swung downward for the carrier H to engage the disk Gr or the work.

On the spindle J is secured an arm K, connected by a link K with a wrist-pin K held on a disk L, secured eccentrically on the face of a worm-wheel L, mounted to turn in suitable bearings 0 carried on the table B. The worm-wheel L is in mesh with a worm L secured on one end of a shaft L journaled in suitable bearings C attached to the top of the table B. The rear end of the shaft L is provided with pulleys L connected by belt with suitable machinery for imparting a rotary motion to said shaft L which by the worm L imparts a slow rotary motion to the worm-wheel L to carry around the disk L and wrist-pin K and cause the link K to act on the arm K in such a manner as to rock the vertically-disposed spindle J. As the latter carries the arm or arms I, it is evident that the arms rock with the spindle, and consequently a lateral movement isgiven to the object engaged by the carriers H. The throw given to the carriers is regulated by changing the position of the disk L accordingly in the face of the worm-wheel L, so as to bring the wrist-pin K nearer to or farther from the center of the worm-wheel L. Vhen the wristpin K is moved nearer to the center of the worm-wheel L on turning the disk L accordingly, then less throw is given to the spindle J, arms I, and carriers I-I than when the wristpin K extends farther away from the center of the worm-wheel.

On the shaft D, below the disk F,is arranged a centrifugal pump having a propeller-wheel N, the hub N of which is secured to said shaft D, and the wings of the wheel N revolve in a casing 0, formed on the lower end of a pan P, adapted to contain the grit or other grinding substance to be placed on the disk F, between the surface of the latter and the object G. The casingO has its outlet in a pipe 0', which extends upward and delivers the material upon the face of the disk F, as will be readily understood by reference to the drawings. The pan P is supported by its rim on the upper end of a cylindrical shell P, attached to the table B, and a cover 0 closes a portion of the casing 0, so that the material can readily flow down into the casing from the pan P and be forced by the propeller-wheel N up through the pipe 0' back upon the face of the disk F. Thus the latter is always supplied with abrading material, and at the same time a rotary motion is given to the disk and a swinging motion to the carrier H to facilitate a proper grinding of the object or work G.

The casing O is formed with a vertical flange 0 extending upward inside the hub N of the propeller-wheel N and outside of the supporting-collar D for the propellerwheel, said collar being formed atits under side with an annular groove engaging a flanged ring D, secured to the table B. By the arrangement described there is no hearing in the pump proper to wear out and grit is not liable to work into the step 0 for the shaft D.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- 1. A grindingmachine, provided with a shaft-carrying an abrading-disk, a pan for holdingthe abradin g material, and a centrifugal pump on said shaft and receiving its supply from said pan, the pump being arranged to discharge onto the said disk, substantially as shown and described.

2. A carrier, comprising a shanked ball, a

sleeve receiving the shank of said ball, a sec 0nd sleeve within which the first sleeve is mounted, and a spindle on which the second sleeve is secured, the spindle entering the first sleeve and engaging the upper end of the ball-shank.

3. A grinding-machine, comprising a table or frame, a vertical shaft or spindle journaled therein, a yoke attached to the upper end of the spindle and having ahorizontal pivot-pin, an arm mounted to swing on the pivot-pin and having work engaging and holding devices, a rock-arm secured to and projecting laterally from the spindle, and automatic means for swinging said rock-arm.

4. A grinding-machine, comprising a table or frame, a vertical shaft or spindle journaled therein, a yoke attached to the upper end of the spindle, each arm having a circular flange thereon, a horizontal pivot-pin supported centrally in said flanges, an arm mounted to swing on the pivot-pin and having work engaging and holding devices, the arm carrying acatch and the circular flange having a notch for the reception of said catch to hold the arm raised, a rock-arm secured to and projecting laterally from the spindle and automatic means for swinging said rock-arm.

5. A grinding-machine, comprising a table or frame, a vertical shaft or spindle journaled therein, a yoke attached to the upper end of the spindle, each arm thereof having a circu lar flange, a horizontal pivot-pin supported centrally in said flanges, an arm mounted to swing on the pivot-pin and carrying work engaging and holding devices, the arm carrying a catch, and the circular flange havinganotch for the reception of said catch to hold the arm raised, a rod extending longitudinally of the arm and controlling the catch, and means for automatically swinging the arm upon the spindle.

G. A grinding-machine, comprisingaframe or table, a work-engaging arm mounted to swing upon a vertical spindle, a rock-arm secured to the spindle portion, a wheel mounted to turn horizontally in the frame or table and having a circular eccentrically-located hole therein, a disk adjustable in said hole and carrying a crank-pin, and a link connecting the crank-pin with the rock-arm.

DAVILLA STURTEVANT THOMPSON.

Witnesses:

JOHN E. BRADBURY, R. MURRAY WHITE. 

